Excavator



(No Model.)

- A. B. BOWERS.

EXCAVATOR.

Patented Nov. 8, 1887.

N4 PEfERs mlvLtnnghKphn washingion D C PATENT trice.

ALPHONZO R. BOWERS, OF SAN FRANCISCO, CALIFORNIA.

EXCAVATO R.

SPECIFICATION forming part of Letters Patent No. 372,956, dated November8, 1887.

Original application filed December 9, 1876, and renewed April 1G, 1879.Divided and this application filed July 16, 1887. Serial No. 244,542.(No model.)

To al'l whom it may concern) Be it4 known that I, -ALPHoNzo B. Bownas,

of San Francisco, California, civil engineer, have invented anImprovement in Excavators,

of which this is a description.

This is a ninth division of the application' It consists of a rotaryexcavator constructed to work with a side feed and either outward orinward delivery, in combination with any suitable device for removingthe spoil, said excavator being provided with peripheral spi#rally-arranged edges or blades having a drawing cut, with devices bywhich these edges or blades are braced and vbound together, and withexcavatingedges on its outer end inclined backward from the direction ofrotation to avoid hooking against obstructions and to give to theseedges a drawing cut.

Figure l is a plan showing one form of this excavator Vin combinationwith a suitable device for receiving and withdrawing the spoil. Fig. 2shows the end cutting-edges and lower ring of the excavator. Fig. 3shows a crosssection through the excavator, through an inner section ofsuction-pipe sometimes used, and-through the excavator-shaft R. Fig. 4is a plan of -the lower end of said suction-pipe and of a portion ofsaid shaft.

C may be any of the well-known devices suitable for removing the spoilfrom either inside or outside of the excavator. As here shown, it is asuction-pipe arranged to take its spoil from the inside, although it maybe arranged to take it from the outside also, as described and claimedin the eighth division of the original application. in the device shown,extends into the hollow excavator E, to support the bearing Rl of theshaft R, and is enlarged and cut away on one side to form an opening, G,for receiving the spoil. The excavator and device for removing thespoil, when used for dredging, is usually supported by a swinging laddersuspended from a derrick or crane by a chain attached to the eye c, orto a ring passing around the suctionpipc at this point, the chains thatIts lower end, T,

in Letters Patent No. 318,859, issued to me May 26, 1885except that inthe present instance all its excavating-edges are constructed andarranged to make a drawing cut, and, like said excavator, some or all ofits several parts may be made separate and detachable, or the whole maybe cast in a single piece.

The vanes k may consist simply of spiral cuttingblades, of suitable formand strength, cast with or secured in any suitable manner to a hub, R2,in the outer end of the excavator (by which rotation is communicated byany suitable power through the shaft R) and to one or morecircumferential ring or rings, by which they are braced and boundtogether, though, when the excavator is cast, it is better to providethese vanes with detachable steel knives S, extending from ring to ringor from end to end of the excavator, according to the preference of theuser or builder. The cutting-edges S and S are set at au angle to give afree clear'- ance and suitable lead.

The stift'ening, bracing, binding rings t are preferably, though notnecessarily, made with beveled cutting-edges projecting outward beyondthe spiral blades, the more easily to subdivide the spoil, and to serveas fenders to enable these blades to ride over and prevent them fromcatching against obstructions, and the ring b, on the inner end of theexcavator, when used with a central suction-pipe, is preferably extendedinward to or near said pipe, where it may be provided with a strongflange to serve as a bearing or hub to run on said pipe, as shown.

I confine myself to neither an inward nor an outward delivery, nor tothe devices or vform of construction shown; but, in this ninth divisionof the original application, I claim- 1. In combination, a rotaryexcavator co'nstructed and arranged to work with a side feed, providedwith excavating edges or blades running spirally along its periphery, adevice for bracing and binding said edges or blades together, and adevice for removing the spoil.

2. In combination, a rotary excavator provided with excavating edges orblades running IOO spirally along its periphery, a stiffening-ring orstiffening-rings, to which said blades are secured and by which they arebraced and bound together, and a suction-pipe for remov- 5 ing thespoil.

3. In combination, a rotary excavator having peripheral excavatingdevices, spirally arranged, and fenders to prevent the cuttingedges ofsaid devices from catching against 1o obstructions.

4. In combination, a rotary excavator having peripheral excavatingdevices spirally arranged, fenders to prevent the cutting-edges of saiddevices from catching against obstructions, and a device for removingthe spoil.

5. In combination, a rotary excavator having peripheral excavatingdevices spirally arranged, fenders to prevent said devices from\eatching against obstructions, and a suctionzo pipe for removing thespoil.

6. In combination, a rotary excavator having peripheral excavating edgesor blades spirally arranged, a device for slicing or dividing the spoildelivered by said edges or blades, and

a device for removing said spoil.

7 In combination, a rotary excavator having peripheral excavating edgesor blades spirally arranged,adeviee for slicing and dividing the spoildelivered by said edges or blades, and

3o a suction-pipe for removing said spoil.

8. In combination, a rotary excavator pro-` vided with excavatingdevices having a drawing cut, and fenders to prevent said devices fromcatching against obstructions.

9. In combination, a rotary excavator provided with excavating deviceshaving a drawing cut, fenders to prevent said devices from catchingagainst obstructions, and a device for removing the spoil.

4o 10. In combination, a rotary excavator provided with excavatingdevices having a drawing cnt, fenders to prevent said devices fromcatching against obstructions, and a suctionpipe for removing the spoil.

11. In combination, a hollow rotary excavator provided with excavatingdevices having a drawing cnt and inward delivery between said devicestothe interior of said excavator, a shaft for actuating said excavator,and a de- 5o vice for removing the spoil.

l2. A hollow rotary excavator with inward delivery and constructed tooperate with a side feed and provided with excavating devices having adrawing cut, a shaft for actuating said excavator, and a suction-pipefor removing the spoil.

13. In combination, a rotary excavator consisting of peripheralexcavating devices spirally arranged, braced, and tied together by acircumferential ring or by circumferential 6o rings, and firmlyconnected to a hub in the end of said excavator, an actuating-shaftsecured to said hub, a bearing for said shaft in the interior of saidexcavator, and a suctionpipe opening into said interior for removing thespoil.

14. In combination, a rotary excavator consisting of peripheralexcavating devices spirally arranged, braced, and tied together andsecured to a hub in the end of said excavator, 7o excavating edges orblades on the end of said cxcavator inclined backward from the directionof rotation, an actuating-shaft secured to the hub and provided with abearing in the interior of said excavator, and a suction-pipe openinginto said interior.

15. In combination, a rotary excavator constructed and arranged to workwith a side feed, provided with excavating edges or blades run ningspirally along its periphery and deliver- 8o ing their spoil to theinterior of said excavator, and a device for removing said spoil.

16. In combination, a hollow rotary excavator provided with excavatingedges or blades ruiming spirally along its periphery and de 85 liveringtheir spoil to the interior of said excavator, and a suction-pipeopening into said interior.

17. In combination, a hollow cylindrical rotary excavator havingexcavating edges or 9o blades running spirally along its periphery anddelivering their spoil tothe interior of said excavator, and asuction-pipe opening into said interior.

18. The hollow rotary excavator E, subg5 stantially as and for thepurpose described, in combination with a device for rotating the same.

A. B. BOVERS.

In presence oi` SCHUYLER DURYEE, E. W. B. PHILLrrs.

